scholarly journals Selection of arbitrarily scaled cross-sections in bending stiffness design

2003 ◽  
Vol 217 (2) ◽  
pp. 113-125
Author(s):  
D Pasini ◽  
D J Smith ◽  
S C Burgess
Keyword(s):  
General Solution ◽  
Cross Sections ◽  
Performance Index ◽  
Selection Procedure ◽  
Performance Indices ◽  
Cross Sectional ◽  
Buckling Instability ◽  
Stiffness Design ◽  
Selection Of

Performance indices can be used to model the relative structural efficiency of different cross-sectional shapes. Performance indices have been previously defined mainly for structural cross-sections that are scaled proportionally in size. This paper extends the method of performance indices by allowing scaling of cross-sections in any direction. A novel feature of the method described in this paper is the inclusion of the space envelope as a design parameter. The first part of the paper gives a derivation of the general solution for the performance index. The second part presents a graphical selection procedure and discusses the efficiency limits of cross-sections due to buckling instability. It concludes with a case study to demonstrate the method.

Performance indices for arbitrarily scaled rectangular cross-sections in bending stiffness design

2002 ◽  
Vol 216 (2) ◽  
pp. 101-113
Author(s):  
D Pasini ◽  
S C Burgess ◽  
D J Smith
Keyword(s):  
Cross Sections ◽  
Performance Index ◽  
Graphical Method ◽  
Bending Stiffness ◽  
Performance Indices ◽  
Cross Sectional ◽  
Stiffness Design ◽  
Design Case Study ◽  
Selection Of

Performance indices are presented for the selection of optimal rectangular beams in bending stiffness design. Previous studies have developed performance indices for only three design cases: proportional scaling of width and height, constrained height and constrained width. This paper extends the methodology of the performance index to any arbitrary direction of scaling. The performance index has the form Eq/p, where q is a function only of the scaling vector between two cross-sectional envelopes of different materials. The paper also presents a graphical method for determining the performance of rectangular beams in stiffness design. The perormance index and the graphical method are applied to a design case study.

A Method of Form Selection for Large Scale Structures

2002 ◽  
Author(s):  
Damiano Pasini ◽  
S. C. Burgess ◽  
D. J. Smith
Keyword(s):  
Cross Sections ◽  
Large Scale ◽  
Design Parameters ◽  
Cross Sectional ◽  
Geometrical Properties ◽  
Large Scale Structures ◽  
Shape Selection ◽  
Efficiency Parameter ◽  
Sectional Shape ◽  
Selection Of

This paper presents a new method for modelling the efficiency of large-scale structural forms. Parametric equations, which include all design parameters and also the effect of buckling, are developed. Shape transformers, envelope efficiency parameter and scaling factor are introduced to describe the geometrical properties of cross-sections and to allow interaction between form and cross-sectional shape selection. Design charts provide insight and understanding and assist the selection of different structural concepts at the preliminary stage of design.

scholarly journals Influence of the Aggregate-Pouring Sequence on the Efficiency of Plugging Inundated Tunnels through Drilling Ground Boreholes

Water ◽  
2020 ◽  
Vol 12 (10) ◽  
pp. 2698
Author(s):  
Xiangming Jiang ◽  
Shuang Hui ◽  
Wanghua Sui ◽  
Zhiyuan Shi ◽  
Jiahao Wang
Keyword(s):  
Particle Size ◽  
Coarse Aggregate ◽  
Early Stage ◽  
Water Pressure ◽  
Field Investigation ◽  
Fine Aggregate ◽  
Flowing Water ◽  
Cross Sectional ◽  
Selection Of

This paper presents an experimental and field investigation on the efficiency of plugging by pouring aggregate in different sequences through multiple boreholes in a tunnel with flowing water. There have been controversies surrounding the selection of the pouring order for different particle sizes of aggregates and the order in different boreholes. A visualized experimental setup is used to investigate the influence of the pouring orders on the efficiency of plugging through multiple boreholes under the flowing-water condition. A case study of the salvage of a flooded mine using ground directional boreholes was investigated and compared with the experimental results. The water-pressure difference at the aggregate-capping moment, when fine aggregate was poured first and coarse aggregate later, was relatively small, compared to that when fine aggregate was poured upstream and coarse aggregate, downstream. The result implies that the efficiency of plugging with the order of pouring fine aggregate first and coarse aggregate later in different boreholes is better than that with the order of pouring fine aggregate upstream and coarse aggregate downstream. When the poured aggregate is about to be capped, increasing the pouring intensity with the same or a larger particle size is more conducive to capping. The case study shows that pouring fine materials in the early stage reduced the cross-sectional area; in the later stage, the aggregate particle size was gradually increased, which can be helpful in forming an effective water-barrier section in the tunnel. The pouring of aggregate provided a base for cement grouting to form a water-plug section with a length of 106 m, resulting in a sealing efficiency of 100% for the case.

The Selection of Performance Indices for Optimal Control Problems

1973 ◽  
Vol 95 (1) ◽  
pp. 24-27 ◽  
Author(s):  
R. L. Woods
Keyword(s):  
Optimal Control ◽  
Performance Index ◽  
Optimal Control Problems ◽  
Performance Indices ◽  
Proper Selection ◽  
Control Effort ◽  
Time Integral ◽  
Quadratic Index ◽  
Selection Of ◽  
A Performance

This paper investigates the proper selection of a performance index to satisfy a word statement of desired effect. A performance index formed as the time integral of Un is solved for various values of n. When viewed in this light, the classical quadratic index (n = 2) gives a seemingly arbitrary solution. From this investigation the true optimal control solution can be ascertained. For the different values of n, solutions for totally different performance can be obtained. Performance indices combining two effects of minimum control effort and minimum response error are also investigated. The differences of a summed combination and a multiplicative combination are studied.

Diachrone Perspektiven im Historischen deutschen Valenzwörterbuch

Glottotheory ◽  
2014 ◽  
Vol 5 (1) ◽  
Author(s):  
Albrecht Greule
Keyword(s):  
Cross Sections ◽  
Middle High German ◽  
Old High German ◽  
Semantic Field ◽  
History Of ◽  
Selection Of

AbstractThe Historic German Valency Dictionary should not be only a synchronic description of the valency of a selection of Old High German, Middle High German and Early Hew High German verbs, but also illustrate the history of valency (diachronic) of these verbs within a semantic field. This paper gives an overview of the previous research undertaken in the field of the history of valency. Based on a case study, it develops a method to illustrate the history of valency by the comparison of synchronic historic cross-sections.

scholarly journals The relationship between traditional activities and the mass-space pattern in Bali Aga Customary Village society – Tenganan Pegringsingan

2020 ◽  
Vol 5 (3) ◽  
pp. 373-390
Author(s):  
Lydia Dewi Setiawan ◽  
Purnama Salura ◽  
Bachtiar Fauzy
Keyword(s):  
Cross Sections ◽  
Local Governments ◽  
Traditional Society ◽  
The World ◽  
Space Pattern ◽  
Village Society ◽  
The Relationship ◽  
Selection Of

Globalization is being experienced throughout the world with its impact also observed in architecture, even in traditional villages of Indonesia. Some of them have, however, been able to maintain their identity such as the mass-space pattern of the customary village of Bali Aga Mountains in Bali which is discovered not to have changed. This research was, therefore, conducted to determine the relationship between the activities of the traditional society and their mass-space patterns using the customary village of Bali Aga Tenganan Pegringsingan as the case study. This involved the selection of respondents purposively and collection of data using cross sections by identifying unchanged buildings, taking photos, videos, drones, and through direct interviews in the field. The data obtained were analyzed qualitatively based on structuring theory or ordering principles and the results confirmed the mass-space pattern in Tenganan Pegringsingan village was built due to the close relations with the traditional activities of the society. The findings can be used in developing architecture by local governments as policymakers as well as academic architects and practitioners, and the wider society. © 2020 Lydia Dewi Setiawan, Purnama Salura, Bachtiar Fauzy

scholarly journals Case study of effective current estimation in main circuit of tram vehicle

2018 ◽  
Vol 180 ◽  
pp. 02004
Author(s):  
Karol Chyła ◽  
Marcin Urbański ◽  
Dominik Sawuła ◽  
Stanisław Rawicki
Keyword(s):  
Cross Sections ◽  
Urban Traffic ◽  
Optimal Selection ◽  
Traffic Loads ◽  
Current Estimation ◽  
Low Energy Consumption ◽  
Modelling Strategies ◽  
Climate Comfort ◽  
Selection Of

Currently the trams are experiencing the renaissance and more and more Polish cities decide to renew the fleet. New vehicles are usually characterized by high transport capacity, low floor, climate comfort, crash resistance, low energy consumption and low axle loads. Such requirements can only be achieved through optimization in many areas of the vehicle's construction. One of such tasks is the optimal selection of components of the main circuit installation and traction needs. The paper is oriented on the issue of engineering modelling of the effective values of currents flowing in the main circuit and the tramway traction needs circuits. Due to the non-periodic nature of the vehicle traffic loads in urban traffic, the optimal selection of the performance parameters helps in better selection of conductor cross sections, filters and safeguards. A better selection of these components means a reduction of its weight, which is extremely important for meet basic requirements of modern tram vehicles. The paper is intended to gather the experience of authors in this field of knowledge and compares several modelling strategies that the authors use during designing tram vehicles. The elaboration summarizes the results obtained using different modelling strategies, and shows correlation between effective value and selection of components.

scholarly journals Influence of Business Characteristics on Selection of Investment Evaluation Techniques: The Case of Tanzanian SMEs

2018 ◽  
Vol 10 (4) ◽  
pp. 41
Author(s):  
Rose J. Katabi ◽  
Romanus L. Dimoso
Keyword(s):  
Financial Management ◽  
Sampling Technique ◽  
Sales Growth ◽  
Cross Sectional Survey ◽  
Cross Sectional ◽  
Frequency Distributions ◽  
Investment Evaluation ◽  
Evaluation Techniques ◽  
Selection Of

This study was conducted in two phases; first as a survey and second as a case study. The study used a cross-sectional survey design to explain the business characteristics influencing the selection of investment evaluation techniques among Tanzanian SMEs. Purposive sampling technique was used to collect data to a sample of 301 SMEs drawn from SIDO in Dar es Salaam and Dodoma regions. Data were collected though questionnaires and transformed into suitable format for analysis using statistical packages for the survey, while for the case study interviews were used. Statistical techniques used in this study were descriptive (frequency distributions) and inferential statistics (multivariate analysis) which were used to determine whether or not there is a relationship between business characteristics and selection of investment evaluation techniques.  Results of this study shows that, sales growth, industry of business, level of education and finance education of owners, were the business characteristics that influence the selection of investment evaluation techniques.Theoretical and practical contributions in the area of investment decisions for SMEs in Tanzania are made based on the findings of the study. On theoretical contributions, the study provided a better understanding on small business characteristics and how they influenced the selection of investment evaluation techniques. On practical contributions, owners should maintain high sales growth; improve education background by attending short courses on financial management, because these two characteristics significantly affect the selection of investment evaluation techniques.

Sign in / Sign up

Export Citation Format

Share Document